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Automation in some form of running with no onboard personnel is a big picture milestone.  When you look at that big breakthrough there seems to be a hundred little details in the present picture that would make crewless running impossible.  But this crewless automation will not come about in a vacuum while all the other operational details stay the same.  The whole picture will evolve.  Lots of little changes will need to be made that have nothing directly to do with crewless running. Ultimately PTC may provide so much improvement in track utilization that there will be an increased number of trains that are smaller and more specialized, thus eliminating much of the mixed freight consists that require setouts and pickups along the way.  PTC may be just one station on a road to a radical new era of automation and equipment utilization.
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